<template>
    <div v-if="isShow" ref="ani" class="small-transition" :class="[ani.in]" :style="'transform:' +transform+';'+stylesObject"
	 @click="change">
		 <slot></slot>
	</div>
</template>

<script>
/**
	 * Transition 过渡动画
	 * @description 简单过渡动画组件
	 * @tutorial https://ext.dcloud.net.cn/plugin?id=985
	 * @property {Boolean} show = [false|true] 控制组件显示或隐藏
     * @property {Array} modeClass = [fade|slide-top|slide-right|slide-bottom|slide-left|zoom-in|zoom-out] 过渡动画类型
     *  @value fade 渐隐渐出过渡
     *  @value slide-top 由上至下过渡
     *  @value slide-right 由右至左过渡
     *  @value slide-bottom 由下至上过渡
     *  @value slide-left 由左至右过渡
     *  @value zoom-in 由小到大过渡
     *  @value zoom-out 由大到小过渡
	 * @property {Number} duration 过渡动画持续时间
	 * @property {Object} styles 组件样式，同 css 样式，注意带’-‘连接符的属性需要使用小驼峰写法如：`backgroundColor:red`
	 */
import Vue from 'vue'
export default Vue.extend({
  name: 'uniTransition',
  props: {
    show: {
      type: Boolean,
      default: false
    },
    modeClass: {
      type: Array,
      default() {
        return []
      }
    },
    duration: {
      type: Number,
      default: 300
    },
    styles: {
      type: Object,
      default() {
        return {}
      }
    }
  },
  data() {
    return {
      isShow: false,
      transform: '',
      ani: { in: '',
        active: ''
      }
    }
  },
  watch: {
    show: {
      handler(newVal) {
        if (newVal) {
          this.open()
        } else {
          this.close()
        }
      },
      immediate: true
    }
  },
  computed: {
    stylesObject() {
      const styles = {
        ...this.styles,
        'transition-duration': `${this.duration / 1000}s`
      }
      let transfrom = ''
      for (const i in styles) {
        const line = this.toLine(i)
        transfrom += `${line}:${styles[i]};`
      }
      return transfrom
    }
  },
  methods: {
    change() {
      this.$emit('click', {
        detail: this.isShow
      })
    },
    open() {
      clearTimeout(this.timer)
      this.isShow = true
      this.transform = ''
      this.ani.in = ''
      for (const i in this.getTranfrom(false)) {
        if (i === 'opacity') {
          this.ani.in = 'fade-in'
        } else {
          this.transform += `${this.getTranfrom(false)[i]} `
        }
      }
      this.$nextTick(() => {
        setTimeout(() => {
          this._animation(true)
        }, 50)
      })
    },
    close(type) {
      clearTimeout(this.timer)
      this._animation(false)
    },
    _animation(type) {
      const styles = this.getTranfrom(type)
      this.transform = ''
      for (const i in styles) {
        if (i === 'opacity') {
          this.ani.in = `fade-${type ? 'out' : 'in'}`
        } else {
          this.transform += `${styles[i]} `
        }
      }
      this.timer = setTimeout(() => {
        if (!type) {
          this.isShow = false
        }
        this.$emit('change', {
          detail: this.isShow
        })
      }, this.duration)
    },
    getTranfrom(type) {
      const styles = {
        transform: ''
      }
      this.modeClass.forEach((mode) => {
        switch (mode) {
          case 'fade':
            styles.opacity = type ? 1 : 0
            break
          case 'slide-top':
            styles.transform += `translateY(${type ? '0' : '-100%'}) `
            break
          case 'slide-right':
            styles.transform += `translateX(${type ? '0' : '100%'}) `
            break
          case 'slide-bottom':
            styles.transform += `translateY(${type ? '0' : '100%'}) `
            break
          case 'slide-left':
            styles.transform += `translateX(${type ? '0' : '-100%'}) `
            break
          case 'zoom-in':
            styles.transform += `scale(${type ? 1 : 0.8}) `
            break
          case 'zoom-out':
            styles.transform += `scale(${type ? 1 : 1.2}) `
            break
        }
      })
      return styles
    },
    _modeClassArr(type) {
      const mode = this.modeClass
      if (typeof (mode) !== 'string') {
        let modestr = ''
        mode.forEach((item) => {
          modestr += (`${item}-${type},`)
        })
        return modestr.substr(0, modestr.length - 1)
      }
      return `${mode}-${type}`
    },
    toLine(name) {
      return name.replace(/([A-Z])/g, '-$1').toLowerCase()
    }
  }
})
</script>

<style lang="scss">
    .small-transition {
        transition-timing-function: ease;
        transition-duration: 0.3s;
        transition-property: transform, opacity;
        .fade-in {
            opacity: 0;
        }

        .fade-active {
            opacity: 1;
        }

        .slide-top-in {
            /* transition-property: transform, opacity; */
            transform: translateY(-100%);
        }

        .slide-top-active {
            transform: translateY(0);
            /* opacity: 1; */
        }

        .slide-right-in {
            transform: translateX(100%);
        }

        .slide-right-active {
            transform: translateX(0);
        }

        .slide-bottom-in {
            transform: translateY(100%);
        }

        .slide-bottom-active {
            transform: translateY(0);
        }

        .slide-left-in {
            transform: translateX(-100%);
        }

        .slide-left-active {
            transform: translateX(0);
            opacity: 1;
        }

        .zoom-in-in {
            transform: scale(0.8);
        }

        .zoom-out-active {
            transform: scale(1);
        }

        .zoom-out-in {
            transform: scale(1.2);
        }
	}
</style>
